2001 Chrysler Sebring Fuel Pump

Tiny
FSHOUP2010
  • MEMBER
  • 2001 CHRYSLER SEBRING
  • 3.0L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 120,000 MILES
Hello, here is what happened had the car into the shop to replace power steering pump, got the car home sat for two days went out to start it and nothing it cranks but no fuel, checked for spark had decent spark but I couldn't hear the fuel pump running when I turned the key. I checked the relay for the fuel it appears alright, I removed it and turned the key to the on position and have two hot sides of the plug in for the relay. I tried checking power back at the fuel pump but my wire codes don't match the wires in the car. There are two hot wires going to the fuel pump itself but they stay on. If the fuel pump was working does it automatically shut itself off when it primed even though it has a constant voltage to the plug. If so would you think the fuel pump is bad.
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Friday, March 6th, 2015 AT 4:22 PM

3 Replies

Tiny
CARADIODOC
  • EXPERT
The fuel pump is supposed to run for just one second after turning on the ignition switch. After that, it turns on again during engine rotation, (cranking or running). The fact that you have spark, (thank you for including that observation), proves the camshaft position sensor and crankshaft position sensor are working and the automatic shutdown (ASD) relay is turning on. That relay sends current to the fuel pump or pump relay.

To say that a different way, you will not have voltage to the fuel pump motor unless a helper is cranking the engine. You can bypass the fuel pump relay to allow you to troubleshoot the system without having to crank the engine or even having the ignition switch on.

The first thing to try though is banging on the bottom of the gas tank. GM fuel pumps usually fail while you're driving leaving you stranded on the side of the road. Chrysler fuel pumps almost always fail by failing to start up, leaving you stranded at home. Once they start up, they stay running until you stop the engine and try to restart it.

Sometimes banging on the tank will jar the motor enough so it will start up when you crank the engine. Sometimes you have to bang on the tank while there is voltage to the motor, as in a helper is cranking the engine or you have the fuel pump relay bypassed.

This applies if you do not hear the hum of the pump for one second when you turn on the ignition switch. If you want to bypass the fuel pump relay, remove it, then jump terminals 30 and 87 together in the relay socket with a piece of wire or a stretched-out paper clip.
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Friday, March 6th, 2015 AT 4:43 PM
Tiny
FSHOUP2010
  • MEMBER
Thanks for the quick response I have been goggling all day trying to find some sort of answer on this downloaded manuals still nothing specific for my car. So if I understand then when you turn to the key over, not to start but to the run position the line is only charged for a second then it shuts off the power. So there is no constant hot wire going to the fuel pump? And in my case not knowing which wire is what I have two hot wires going to the pump, that stay on when the key is turned to the run position not cranking the engine. My relay doesn't look like that its a Mitsubishi relay 4 prongs two on each side. If I am looking at the right relay. When you turn the key to run it has two hot sides. Very hard to understand I know, without seeing the Vehicle. I was told the 2001 sebring Coupe with the 3.0L was a problem child to start with. My fuse box has the L shape to it, I figured the relay was the furthest one to the from of the car by the fender. I believe it says something like Coil, Coil on one side and Com and something else on the other. I ordered a fuel pump tonight but now after reading your reply I am not sure I did the right thing. When I tested the wires at the pump I used a Light tester, and I only had two wires that had power but they did not go off after the key was in the on position.
I double checked the spark, its still has spark. Not sure what else to do cant figure out how to by pass the relay cause im not sure I have the right one.
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Friday, March 6th, 2015 AT 5:38 PM
Tiny
CARADIODOC
  • EXPERT
I'm not sure where to start because I'm running out if time where I'm using their wireless internet. There's too much I want to cover, and it takes a while to look up the information you need. I'll get as far as I can to get you started.

You're right to find two terminals for the pump relay to have 12 volts all the time. They're tied together. One is the high-current supply that gets switched onto the pump's feed wire, and the other one feeds the relay's low-current coil. Of the other two, the small black wire gets grounded by the Engine Computer when it wants to turn the pump on. 12 volts gets switched onto the green wire that runs to the pump.

The easiest, since you're already down by the pump, is to look for that green wire. A test light is much better for this than a digital voltmeter because you can see the light easily and it puts a load on the circuit. A break in the wire that is bridged by a little carbon track will be picked up by a voltmeter and falsely say the circuit is okay. No current will get through that break to run the pump OR the test light, therefore, the test light is more accurate. You can unplug the connector and stick the probe of the test light in there. Watch if the light turns on for one second, then again when you crank the engine. If it does turn on during cranking, you've eliminated everything but the pump and its ground wire. 99 percent of dead fuel pumps are caused by those two sensors which also cause no spark. Since you have spark, all that stuff is known to be okay too.

There is no common problem on Chrysler products with the fuel pump's ground circuit, so while we should check it, the pump is the likely suspect, especially at the mileage you listed.

As for bypassing the relay so you can work on the circuit, you can use either terminal with 12 volts all the time for the supply, then just touch the jumper wire from there to each of the other two terminals. At some point those other two terminals are going to have 12 volts on them so jumping it there won't hurt anything. Do that though with the ignition switch off so the computer will never try to ground that jumper wire in an attempt to turn on the missing relay.
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Friday, March 6th, 2015 AT 6:52 PM

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